step 1:
Go to Start>>All Programs>>Accessories>>Click Command Prompt.
On newer versions of Windows right mouse click and choose RUN AS ADMINISTRATOR.
step 2:
Click Start>>Computer/My Computer.
Look for a Removable (F:)(Example only)
step 3:
Type F:
then enter. You will notice that the blinking line will go down and display F:\>
step 4:
Now type in attrib -s -h -r /s /d then enter, the blinking line will go down again.
like ----- F:\>attrib -s -h -r /s /d
step 5:
Go to your drive, and see if you can now see all of the hidden files now.